Semester Schedules
SDI offers courses beginning each month. Semesters are 16 weeks in length with courses of various lengths, typically 8-weeks and 4-weeks, within the semester. The academic week begins at midnight Monday through 11:59 pm Sunday, Mountain Standard Time. Courses are therefore scheduled to begin on Mondays and end on Sundays, regardless of how any holidays fall.
2023
1/23/23
2/20/23
3/27/23
4/24/23
5/22/23
6/19/23
7/24/23
8/21/23
9/18/23
10/16/23
11/20/23
12/18/23
The online classroom is available during holidays. However, the administrative offices will be closed during the holidays listed below. When the holidays fall on the weekend, SDI will typically align with the Federal observance, usually the Friday prior or the Monday following such holiday. Current students will be informed of specific office closures by email and/or website updates.
- New Year’s Day
- Martin Luther King Day
- President’s Day (Washington’s Birthday)
- Memorial Day
- Juneteenth
- Independence Day
- Labor Day
- Columbus Day
- Veterans Day
- Thanksgiving
- Thanksgiving Friday
- Christmas Eve
- Christmas Day
Online Classroom
SDI’s online classroom is generally available 24 hours a day, 7 days a week to provide the most flexibility to students.
Office hours
Monday – Friday 8:00 a.m. – 5:00 p.m. (MST)
Note that Arizona does not switch to daylight savings time. Therefore, the office hours remain Mountain Standard Time year-round.

It’s something that I definitely am glad I was able to experience. They’re gonna get you ready for things that you wouldn’t think that you would even want to take on or aspects of the industry that you normally wouldn’t even have thought of doing. It’s a good experience. And if you want to be a gunsmith and it’s a field that you want to get into, it’s an invaluable tool that I don’t even think you should cut out.
Zach Brokaw2022 SDI Associate of Science in Firearms Technology Degree Graduate